CN103018680B - Metering method and metering device of battery level and battery supply set - Google Patents
Metering method and metering device of battery level and battery supply set Download PDFInfo
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- CN103018680B CN103018680B CN201210537717.0A CN201210537717A CN103018680B CN 103018680 B CN103018680 B CN 103018680B CN 201210537717 A CN201210537717 A CN 201210537717A CN 103018680 B CN103018680 B CN 103018680B
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- battery
- circuit voltage
- open circuit
- electric quantity
- correction coefficient
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a metering method and a metering device of battery level and a battery supply set. The metering method of the battery level comprises the following steps: detecting the output end voltage and the temperature of the battery; obtaining a corresponding first correction coefficient according to a battery opening circuit voltage of the last moment ; obtaining a second correction coefficient according to the battery temperature; utilizing the voltage of the output end of the battery, the first correction coefficient, the second correction coefficient, the battery opening circuit voltage of the last moment and the time interval of the last moment to calculate an real-time battery opening circuit voltage; and transforming the real-time battery opening circuit voltage into the battery level to display.
Description
Technical field
The present invention relates to battery supply set, relate in particular to a kind of metering method and measuring apparatus of battery electric quantity.
Background technology
At present in the portable electronic devices such as mobile phone, notebook, the most frequently used battery is lithium ion battery, and in the use procedure of these equipment, the state of charge SOC(stage of charge of battery) be a very important physical quantity, it can allow user have one objectively to understand to remaining electric weight.In prior art, there is the practice of the battery electric quantity of multiple meter electronic apparatus, as more conventional voltage method, directly battery output end voltage is divided into the different interval and different electric weight of corresponding demonstration, by the relation of single cell voltage and electric weight, calculates dump energy.But cell voltage and electric weight are not absolute corresponding relation, also can be subject to the impact of discharge current and working temperature.Therefore in this case, be easy to give the prompting of user error, even there will be the situation of false alarm, error cut-off machine.
In addition relatively conventional also have by coulombmeter calculates the electric weight that is filled with battery and the method for emitting the mimic channels such as the method for electric weight of battery and impedance tracing.As a kind of electric quantity metering circuit that utilizes coulometer proposing in patent 200610150400.6, its theory diagram as shown in Figure 1, need to detect discharge current and the temperature of electric battery, after amplifying by amplifier circuit, through correcting circuit and a plurality of comparer, input to Port Multiplier again and show.Wherein correcting circuit comprises a plurality of devices such as device 141-149 and totalizer 152,154 and 156.Although what visible this metering circuit adopted is the form of several data model, but the structure of its mimic channel is very complicated, increase along with access times, the error of coulombmeter is by increasing, for the repeatedly measurement of battery discharge current, also can produce in addition the error of accumulative total, these all will have influence on the precision of battery electric quantity.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of battery electric quantity metering method and measuring apparatus, to overcome the problem that error in dipping of the prior art is large and metering circuit is too complicated.
For achieving the above object, the invention provides following technical scheme:
A kind of battery electric quantity metering method according to the preferred embodiment of the present invention, comprising:
Detect battery output end voltage and temperature;
According to the battery open circuit voltage in a upper moment, obtained the first corresponding with it correction coefficient;
According to battery temperature, obtain the second corresponding with it correction coefficient;
Utilized described battery output end voltage, the first correction coefficient, the second correction coefficient, the battery open circuit voltage in a upper moment and calculated real-time battery open circuit voltage with the time interval in a upper moment;
Real-time battery open circuit voltage is converted to battery electric quantity to be shown.
Further, comprise the following steps: to judge that according to the rate of change of described battery open circuit voltage whether battery is in relaxed state;
When battery is during in relaxed state, described battery open circuit voltage is set and equals described battery output end voltage.
Further, comprise the following steps: real-time battery open circuit voltage to store, in order to calculate next battery open circuit voltage constantly.
Further, comprise the following steps: battery to test, obtain the corresponding relation of battery open circuit voltage and battery electric quantity, and accordingly real-time battery open circuit voltage is converted to battery electric quantity.
Further, comprise the following steps: battery to test, obtain the corresponding relation of described the first correction coefficient and described battery open circuit voltage and the corresponding relation of described the second correction coefficient and described battery temperature.
A kind of battery electric quantity metering device according to the preferred embodiment of the present invention, comprising:
Pick-up unit: in order to detect battery output end voltage and temperature;
Memory storage: obtained first correction coefficient corresponding with the battery open circuit voltage in a upper moment, second correction coefficient corresponding with battery temperature according to the data of storage;
Calculation element: calculate real-time battery open circuit voltage according to battery open circuit voltage constantly of described battery output end voltage, the first correction coefficient, the second correction coefficient, upper one and with upper one time interval constantly;
Display device: real-time battery open circuit voltage is converted to battery electric quantity and shows.
Preferably, further comprise a calibration circuit;
Described calibration circuit is connected with described pick-up unit, calculation element, and judge that according to the rate of change of battery open circuit voltage whether battery is in relaxed state, and at battery, described battery open circuit voltage is set during in relaxed state and equals described battery output end voltage.
Preferably, described memory storage is stored real-time battery open circuit voltage, in order to calculate next battery open circuit voltage constantly.
Preferably, the data of the corresponding relation of described memory device stores characterizing battery open-circuit voltage and battery electric quantity are to offer display device; The corresponding relation of battery open circuit voltage and battery electric quantity is by testing and obtain battery.
The data of the corresponding relation of the characterizing battery open-circuit voltage that preferably, described memory device stores obtains by battery testing and the corresponding relation of the first correction coefficient and battery temperature and described the second correction coefficient.
A kind of battery supply set according to the preferred embodiment of the present invention, comprises charge power supply, battery, consumer, also comprises according to any one battery electric quantity metering device of the present invention;
Described charge power supply charges to provide electric energy to consumer to battery;
Described battery electric quantity metering device is in order to measure and to show battery electric quantity.
Known via above-mentioned technical scheme, compared with prior art, the invention provides a kind of method with digital circuit electric quantity metering, by setting up the equivalent model of battery and battery being carried out to a series of test, only need detection battery output end voltage and working temperature by digital circuit, to be calculated and can be obtained battery electric quantity again, circuit is realized fairly simple while voltage detecting and is replaced current detecting can further improve the precision of electric quantity metering.By the specific descriptions of preferred embodiment below, above and other advantage of the present invention is more apparent.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Figure 1 shows that the theory diagram according to a kind of battery fuel gauge circuit of prior art;
Figure 2 shows that the equivalent-circuit model of battery;
Figure 3 shows that the process flow diagram according to the battery electric quantity metering method of one embodiment of the invention;
Figure 4 shows that the open-circuit voltage of battery and the relation curve of battery electric quantity (OCV-SOC);
Figure 5 shows that the theory diagram according to the battery electric quantity metering device of one embodiment of the invention;
Figure 6 shows that the theory diagram according to the battery electric quantity metering device of further embodiment of this invention.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.In order to make the public that the present invention is had thoroughly and be understood, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the present invention completely.
At present generally adopt the state of charge SOC of battery to describe battery electric quantity both at home and abroad, in order to the dump energy of characterizing battery.And the SOC of battery is except the power consumption of consumer, be generally also subject to the impact of inside battery pressure drop, and the variation of the internal pressure drops of battery and the temperature of battery and battery open circuit voltage is relevant.Equivalent-circuit model with reference to the battery shown in Fig. 2 can find out, the inner structure of battery can be equivalent to the controllable voltage source of two series connection: the internal pressure drops V of battery
intwith battery open circuit voltage V
icv(Open Circuit Voltage), and battery output end voltage V
batcan be expressed as two controllable voltage source sums, i.e. V
bat=V
int+ V
ocv.
According to practical experience and data fitting, described inside battery pressure drop V
intwith battery open circuit voltage V
ocvand the relation of battery temperature can be with the first correction coefficient K
1, the second correction coefficient K
2be expressed as formula (1), wherein said the first correction coefficient K
1with battery open circuit voltage V
ocvthere is corresponding relation, the second correction coefficient K
2there is corresponding relation with battery temperature:
Following about battery open circuit voltage V by obtaining in formula (1) substitution battery output end voltage formula
ocvrelational expression:
Formula (2) is carried out, after discretize, obtaining following formula:
Wherein Δ t represents the time interval between k sampling instant and (k-1) individual sampling instant.Formula (3) is arranged and is derived:
By formula relation above, can be found out the battery output end voltage V when known solid
bat, upper one battery open circuit voltage V constantly
ocv(k-1) numerical value and with it the first correction coefficient K of correspondence
1, the second correction coefficient K corresponding with battery temperature
2situation under, can calculate real-time battery open circuit voltage.
Therefore by the foundation of above-mentioned battery equivalent-circuit model with analyze the metering method that can obtain battery electric quantity.With reference to figure 3, be depicted as the process flow diagram according to the metering method of battery electric quantity of the present invention, comprising following steps:
S301: detect battery output end voltage V
batand temperature;
S302: obtained the first corresponding with it correction coefficient K according to the battery open circuit voltage in a upper moment
1;
S303: obtain the second corresponding with it correction coefficient K according to battery temperature
2;
S304: utilize described battery output end voltage, the first correction coefficient K
1, the second correction coefficient K
2, upper one battery open circuit voltage constantly and calculate real-time battery open circuit voltage with upper one time interval constantly;
S305: real-time battery open circuit voltage is converted to battery electric quantity and shows.
Wherein in step S304, may further include: the real-time battery open circuit voltage calculating is stored, in order to calculate next battery open circuit voltage constantly.The battery open circuit voltage V of k the sampling instant that storage calculates
ocv(k), in order to calculate the battery open circuit voltage V of (k+1) individual sampling instant
ocv(k+1).
This shows that each battery open circuit voltage constantly all had the battery open circuit voltage in a upper moment to calculate, and the battery open circuit voltage of initial time equals initial battery output end voltage.
Because battery open circuit voltage and battery electric quantity have certain corresponding relation, and this relation can obtain its OCV-SOC relation curve by battery is tested, lithium battery OCV-SOC graph of relation as shown in Figure 4.Therefore in step S305, may further include following methods: battery is tested, obtain the corresponding relation of battery open circuit voltage and battery electric quantity, and corresponding data are stored with the form of the table of comparisons, by tabling look-up, obtain the value of battery electric quantity SOC after learning real-time battery open circuit voltage by calculating.
According to electric quantity metering method of the present invention, can further include: battery is tested, obtained described the first correction coefficient K
1corresponding relation and described battery temperature and described the second correction coefficient K with described battery open circuit voltage
2corresponding relation, and corresponding data is stored;
Like this in the process of calculating according on a battery open circuit voltage constantly and the battery temperature detecting, the data of contrast storage both can obtain first, second correction coefficient K calculating in real time
1, K
2.
For described the first correction coefficient K
1with the second correction coefficient K
2the test following way of can specifically sampling: some, the battery that utilizes identical same batch of model, performance, parameter, manufacturing process, be placed in constant temperature oven, utilize high-precision multimeter to detect and record charging/discharging voltage and the electric current of battery, the data of record are carried out to statistics analysis to obtain desired data.
When battery is reused battery for a long time after relaxed state on the shelf, need to calibrate battery electric quantity, preferred calibration steps can adopt the following step:
Detect battery open circuit voltage V
ocvdifferential value
whether be less than certain threshold value, if within the regular hour, (being generally 1.5 hours ~ 3 hours)
all the time be less than the threshold value of setting, the rate of change of described open-circuit voltage remains on below setting value for a long time, just judges that battery is in relaxed state, battery open circuit voltage is now set and equals battery output end voltage (V
ocv(k)=V
bat(k)), with the metering to battery electric quantity, calibrate, guarantee that battery changes the initial time of duty into from relaxed state, electric weight shows more accurate.
By above explanation, can be found out: the invention provides a kind of method with digital circuit electric quantity metering, by setting up the equivalent model of battery and battery being carried out to a series of test, only need detection battery output end voltage and working temperature by digital circuit, to be calculated and can be obtained battery electric quantity again, circuit is realized the fairly simple while without detecting discharge current.
In addition, the present invention also provides a kind of battery electric quantity metering device, and in Fig. 5, the supplying cell of consumer is connected with battery electric quantity metering device 500, and described battery electric quantity metering device comprises:
Pick-up unit 501: in order to detect battery output end voltage V
batand temperature;
Memory storage 502: receive the information of the battery temperature that described pick-up unit 501 provides, and obtain the first correction coefficient K corresponding with upper one battery open circuit voltage constantly according to the data of storage
1and the second correction coefficient K corresponding with battery temperature
2;
Calculation element 503: receive the battery output end voltage V that described pick-up unit 501 provides
bat, and the first correction coefficient K providing according to memory storage 502
1, the second correction coefficient K
2with upper one battery open circuit voltage constantly and with upper one time interval constantly, calculate real-time battery open circuit voltage;
Display device 504: be connected with described calculation element 503, real-time battery open circuit voltage be converted to battery electric quantity and show.
Wherein said calculation element 503 and memory storage 502 can be realized the transmitted in both directions of data, described calculation element 503 is stored the data transmission of the real-time battery open circuit voltage calculating to described memory storage 502, when calculating the battery open circuit voltage in next moment, transfers to described calculation element 503 again by described memory storage 502.
Wherein said display device 504 is also connected with described memory storage 502, the data (OCV-SOC relation curve) of the battery open circuit voltage that described memory storage 502 storages obtain by battery testing and the corresponding relation of battery electric quantity also offer described display device 504, so that battery open circuit voltage is converted to battery electric quantity.
Further, (concrete method of testing is being introduced above to some extent for described the first correction coefficient of sign that described memory storage 502 storages obtain by battery testing and the data of the corresponding relation of described battery open circuit voltage and the corresponding relation of battery temperature and described the second correction coefficient, repeat no more), form storage by data with the table of comparisons, thinks that calculation element provides calculating parameter.
Battery electric quantity metering device shown in Fig. 6, on basis embodiment illustrated in fig. 5, to have added a calibration circuit 601, it is connected with calculation element 503 with described pick-up unit 501, in order to battery electric quantity is calibrated when relaxed state on the shelf is reused again for a long time at battery.
Described calibration circuit 601 judges that according to the rate of change of the open-circuit voltage of battery whether battery is in relaxed state, the rate of change of described open-circuit voltage remains on below setting value for a long time, just judge that battery is in relaxed state, the battery output end voltage that now described calibration circuit provides according to pick-up unit 501, battery open circuit voltage to calculation element output arranges, and makes it equal described battery output end voltage (V
ocv(k)=V
bat(k)), with the metering to battery electric quantity, calibrate, guarantee that battery changes the initial time of duty into from relaxed state, electric weight shows more accurate.
The present invention also provides a kind of battery supply set, comprises charge power supply, battery, consumer and foundation arbitrary suitable battery electric quantity metering device of the present invention; Described charge power supply charges to provide electric energy to consumer to battery; Described battery electric quantity metering device is in order to measure and to show battery electric quantity.Comprise that as can be seen here the power-supply unit of foundation battery electric quantity metering device of the present invention is also within protection scope of the present invention.
In addition, also it should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.
Above-mentioned explanation to provided embodiment, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle provided in this article and features of novelty.
Claims (9)
1. a battery electric quantity metering method, is characterized in that, comprising:
Detect battery output end voltage and temperature;
According to the battery open circuit voltage in a upper moment, obtained the first corresponding with it correction coefficient;
According to battery temperature, obtain the second corresponding with it correction coefficient;
Utilized described battery output end voltage, the first correction coefficient, the second correction coefficient, the battery open circuit voltage in a upper moment and calculated real-time battery open circuit voltage with the time interval in a upper moment;
Real-time battery open circuit voltage is converted to battery electric quantity to be shown;
According to the rate of change of described battery open circuit voltage, judge that whether battery is in relaxed state;
When battery is during in relaxed state, described battery open circuit voltage is set and equals described battery output end voltage.
2. battery electric quantity metering method according to claim 1, is characterized in that, further comprises: real-time battery open circuit voltage is stored, in order to calculate next battery open circuit voltage constantly.
3. battery electric quantity metering method according to claim 1, is characterized in that, further comprises: battery is tested, obtained the corresponding relation of battery open circuit voltage and battery electric quantity, and accordingly real-time battery open circuit voltage is converted to battery electric quantity.
4. battery electric quantity metering method according to claim 1, it is characterized in that, further comprise: battery is tested, obtained the corresponding relation of described the first correction coefficient and described battery open circuit voltage and the corresponding relation of described the second correction coefficient and described battery temperature.
5. a battery electric quantity metering device, is characterized in that, comprising:
Pick-up unit: in order to detect battery output end voltage and temperature;
Memory storage: obtained first correction coefficient corresponding with the battery open circuit voltage in a upper moment, second correction coefficient corresponding with battery temperature according to the data of storage;
Calculation element: calculate real-time battery open circuit voltage according to battery open circuit voltage constantly of described battery output end voltage, the first correction coefficient, the second correction coefficient, upper one and with upper one time interval constantly;
Display device: real-time battery open circuit voltage is converted to battery electric quantity and shows;
Calibration circuit is connected with described pick-up unit, calculation element, and judges that according to the rate of change of battery open circuit voltage whether battery is in relaxed state, and at battery, described battery open circuit voltage is set during in relaxed state and equals described battery output end voltage.
6. battery electric quantity metering device according to claim 5, is characterized in that, described memory storage is stored real-time battery open circuit voltage, in order to calculate next battery open circuit voltage constantly.
7. battery electric quantity metering device according to claim 5, is characterized in that, the data of the corresponding relation of described memory device stores characterizing battery open-circuit voltage and battery electric quantity are to offer display device; The corresponding relation of battery open circuit voltage and battery electric quantity is by testing and obtain battery.
8. battery electric quantity metering device according to claim 5, it is characterized in that the data of the corresponding relation of the characterizing battery open-circuit voltage that described memory device stores obtains by battery testing and the corresponding relation of the first correction coefficient and battery temperature and described the second correction coefficient.
9. a battery supply set, comprises charge power supply, battery, consumer, it is characterized in that, comprises the battery electric quantity metering device described in claim 5-8 any one;
Described charge power supply charges to provide electric energy to consumer to battery;
Described battery electric quantity metering device is in order to measure and to show battery electric quantity.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210537717.0A CN103018680B (en) | 2012-12-11 | 2012-12-11 | Metering method and metering device of battery level and battery supply set |
| TW102136209A TWI491901B (en) | 2012-12-11 | 2013-10-07 | Battery metering method, metering device and battery-powered equipment |
| US14/082,984 US9645200B2 (en) | 2012-12-11 | 2013-11-18 | Battery power measuring method, measuring device and battery-powered equipment |
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| CN201210537717.0A CN103018680B (en) | 2012-12-11 | 2012-12-11 | Metering method and metering device of battery level and battery supply set |
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| CN103018680B true CN103018680B (en) | 2014-07-16 |
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| US (1) | US9645200B2 (en) |
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| CN104880673A (en) * | 2015-05-11 | 2015-09-02 | 深圳天珑无线科技有限公司 | Method for measuring battery electric quantity and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| US9645200B2 (en) | 2017-05-09 |
| TWI491901B (en) | 2015-07-11 |
| US20140163910A1 (en) | 2014-06-12 |
| TW201428321A (en) | 2014-07-16 |
| CN103018680A (en) | 2013-04-03 |
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